As an owner of monstercards.store I would like to share my opinion.

I'm afraid that such changes will hit small markets the most.
DAO, Peakmonster, and Splinterlands are founded from other sources. For the rest markets, this 5% fee is all we get, yet we share most of this fee with our customers.

From the point of view of a small new market, it is really hard to compete with existing big players. Running the environment (without big traffic for now) costs me about $60 per month, not to mention my work. So the proposition to cut my only revenue from running the market by 30% and donating DAO instead is unacceptable to me.